Latest Discussions : HVAC


11:03AM | 07/03/04
Member Since: 07/02/04
3 lifetime posts
I am in the middle of replacing a "Carrier" thermostat with a "Hunter" Model 42999B. I removed the facing from the "Carrier" and noted the wiring diagram:







The "Hunter" diagram has:

RH, R, or 4 24 Volt

RC, VC 24 Volt Cool

G or F fan

Y, C, or M (air cond compressor)

W or H heating

How do I know which Y and C to use? Where does the O go. Am I corect that G, W, and R correlate? I have been burning up for 1 week now and can not get someone to help. What do I do with the extra wire?

Thanks in advance for any assistance received.


07:20PM | 07/03/04
Member Since: 07/02/04
3 lifetime posts
Thank you for replying.

I purchased the Hunter thermostat with the understanding that a homeowner would be able to install.

To answer your questions, the unit I am replacing is the central heating and air thermostat, the home is total electric. The old thermostat, Carrier, has no model number or serial # that I could find (paper states Builders Model thermostat TSTAT), it is digital, which went out when my heating and air went out, it would only run fan, 24/7 with no shut off capability. I finally shut the power off to the unit/house. Carrier is the brand name of the heating and air unit, Single Supply Circuit, volts 208/230.

I believe I will wait several more days (holiday) to call someone in. After reading information on your site, I was one of those that was told I was constantly losing freon and had to be "recharged" only to find out I was being taken, thus the reason I am/was reluntant to call anyone on this.


05:57AM | 07/04/04
Member Since: 07/02/04
3 lifetime posts
Thank you. After your warnings about a possible fire, I will contact a professional. Appreciate the time you spent responding. May you and yours have a safe and wonderful 4th of July.

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